CVE-2023-26999

CRITICALNVD 9.89.8—

9.8

An issue found in NetScout nGeniusOne v.6.3.4 allows a remote attacker to execute arbitrary code and cause a denial of service via a crafted file.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 79.1%
KEV: Not listed

Published

January 9, 2024

Last Modified

June 16, 2025

Advisory Details (1)

Auto-updated Jun 1, 2026

No patch confirmed yet.

generic

NETSCOUT Observability, Cybersecurity, DDoS, & AIOps Solutions

http://netscout.com

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-611Improper Restriction of XML External Entity Reference (XXE)

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:11 UTCepss_batch
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2026-06-02 20:12 UTCepss_batch
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2026-05-29 13:43 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch

Frequently asked(5)

What is CVE-2023-26999?

CVE-2023-26999 is a critical vulnerability published on January 9, 2024. An issue found in NetScout nGeniusOne v.6.3.4 allows a remote attacker to execute arbitrary code and cause a denial of service via a crafted file.

When was CVE-2023-26999 disclosed?

CVE-2023-26999 was first published in the National Vulnerability Database on January 9, 2024, with the most recent update on June 16, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-26999 actively exploited?

CVE-2023-26999 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-26999?

CVE-2023-26999 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2023-26999?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-26999, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2023-26999

📅 Published

🔄 Last Modified

📋 Advisory Details (1)

NETSCOUT Observability, Cybersecurity, DDoS, & AIOps Solutions

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-26999?

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Frequently asked(5)

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